Motion transforming mechanism



June 23, 1931. I c, #LQRISSON I I 1,811,578

MOTION TRANSFORMING MECHANISM Filed Oct. 30. 1929 2 Sheets-Sheet 1 June 23, 1931. c. L. FLORISSON 1,811,573

MOTION TRANSFORMING mmcrmmsm Filed Oct. 30. 1929 2 Sheets-Sheet 2 45 showing the use of a plurality ofpulleys.

Patented June 23, 1931 UNITED s ATEs PATENT" OFFICE amazes LOUIS I'LORISSON, OFYCOURBEVOIE, BE oon-ims-BmiYEREs, FRANCE/AS; sIGfi'oR on ONE-HALE'IO SOGIETE DE connn'lvsn rion a DAPPLIGATIQNS ME A-f NIQUEs, or PARIS, FRANCE, noonronn'rioiv or FRANGE MOTION TRANSFORMING MEoImnIsM Application fi led October 30,1929, Serial No. 403,465, and inFrance November 8, 19 28.

The present invention has for its object a device'for obtaining, from a movement of rotation of constant direction about anaxis or shaft, either a reciprocating movement of a member or element, or'a movement of rota- 'tion of another shaft, these latter movements (reciprocating movement or-movement of rotation of the second shaft) being of definite and limited amplitude'wjith' rapid return to the original position of the member or shaft driven, and with-v automatic renewal of the two successive operations above pointed out, to wit, controlled movement and return to the original position. v K

This transforming device is essentially composed of a wire or flexible strip, stretched between two springs and wrapped about a the invention and thexmeans for establishing the device tobe well understood.

Fig. 1 is atransforming devicefor producing reciprocating movement; V Fig. 2 is a perspective detail of a disengag ing fork lpartially'showing the same on a larger scale; 1

Fig. 3 is'a transforming devicefor producing circular alternating movement.

Fig. 4 shows a modificationof th'e device illustrated inFig. 1. .j 3

Fig. 5 is a diagram illustrating the control of a plurality of-reciprocable members.

Fig. 6 is a diagram analogous to Fig B,

I J :of the mountin of the device,

: In-th'e drawing .0 represents the driving shaft :turning 'inthe direction indicated by the arrow. On said shaft is keyed a wheel A whose rim is provided with a certain number of ratchet teeth B, C, D these being three such in-the direction ofmovement. i

Q A wire 'EF stretched by two springs G, H respectively attached to fixed members I and g is wrapped about the wheel along an arc K, L determined in advance by the angle given byconstruction to the twolengths of cable EKand LF. The movable body to be driven is fixed on the wire at N for example. v The springsG-andHare chosenf in a way that the effort of return spring G, during the 1 wholestroke of thewire', is greater than the sum of the/effort of the stretching springH and the tangential force of friction ofthe wireonthe wheel. The tangential force remainingitending to displace the wire to the i left is less than the tangential motive force 7 of the wheel A; v The wirelca'rries at apoint a smalltransverse rod M which iscaught by the straight sideof the ratchet teeth during rotation of the wheel, as shown in detail ;,Fig;-2, the ratchet,- for example, being'grooved at half width of the thewire. I I r y A stop, forstopping the stroke of the wire towards th e' left', is disposed ina way that thei absence of the ratchet on the arc KL 7 the cross-piece 'M occupiesadposition near of the wheel Afthe following operations succeedleao'h'other w wheel to permitthe passage of. Q

The memb r N beingat rest iin the position g N tlie originfof itsmovement, a ratchet tooth arriving at Kseizes the crosspiece M.

i From this ;moment on the member N takes 5o teethiinlthe embodiment illustrated. Said ratchet teeth ha-vetheir straight side turned 7 rectilinear movement towards the right at a speed d9 Ra-t R being the radius of the wheel A and its angular speed so that the movement of N is therefore controlled in a definite way by that of the driving shaft 0. When the ratchet tooth and the cross-piece M arrive at the extremity L of the winding arc, the cross-piece M is released from the ratchet tooth, the speed of N towards the right ceases and the cross-piece being no longer rigid with the wheel, the spring Gr returns the movable member to its original position from its extreme position N The different phases of movement above take place during passage of each ratchet tooth over the arc ICL.

Instead of causing the cross piece M to become disengaged only on the straight side of the ratchet tooth at L, I may limit the driving arc to a smaller value than the winding are by disposing a fork straddle of the wheel such fork being fixed as at P (Fig. 2) and inclined along the radius.

When the cross-piece M arrives in contact with the fork, it becomes clamped in the V formed by the straight side of the ratchet tooth and the'inclined surface of the fork thereby becoming driven outwardly which frees the same of the ratchet tooth.

I therefore have by means of the above described device the possibility of driving the movable member N in a rectilinear move ment, as described at the beginning of this specification.

In the case where it is desired to obtain a movement of rotation, I cause one of the extremities of the wire EF, E for example, to pass over a wheel Q, of the desired diameter. This result is obtained by the modification illustrated in Fig. 3.

The ratio of the radii of the two wheels is obviously chosen at will.

Obviously I do not depart from the scope of the invention by providing the wheel A with any number of ratchet teeth disposed equidistantly or not; by substituting therefor indentations on the periphery of the wheel A; by substituting for the wire a flexible thin strip L (Fig. 4), in which case the ratchet tooth'A may be a simple tooth and the cross-piece M can be replaced by a hole R in the flexible strip L by substituting for the wheel A or the wheel Q cams of a predetermined law allowing to obtain for the movable member N or the shaft of the wheel Q, controlled strokes wh'ose move:- ment law will be a predetermined function of the advance of the motor shaft. The wire may be given any length and its movement can be guided or deviated by grooves in fixed members or rollers. The springs can naturally be of any nature and shape provided that their elastic forces answer the definition above indicated. I may control simultaneously from a driving shaft S (Fig. 5), the rectilinear movement of several members such as N N N connected together by the wire L I may also control simultaneously from a driving shaft S (Fig. 6) several shafts such as T T carrying the wheels or cams Q Q on which the strip L is wrapped. The motor shaft can be given a movement of constant rotation 01' a variable speed according to a predetermined law;

I can cite, by way of concrete example, thedevice above disclosed, is readily applicable to chronographs, recorders, oscillographs, serving as the marking element or the 1uminous ray, sounding apparatus or measurers of distance'by echo, optical systems, graphic or photographic recorders and the like.

Having described my invention what I claim as new and desire to secure by Letters Patent is: i i

l. A mechanical movement of the type described comprising a driving shaft, a ratchet wheel on said driving shaft, flexible means extending part way round the periphery of said ratchet wheel, resilient means supporting the ends of said flexible means, means on said flexible means for engaging the teeth of said ratchet wheel and reciprocable means operatively engaged by said flexible means.

2. A mechanical movement of the type described comprising a driving shaft, a grooved ratchet wheel on said driving shaft, a plurality of pairs of ratchet teeth on said wheel, flexible means in said groove extending part way round the periphery of said ratchet wheel, resilient means supporting the ends of said flexible means, a cross-piece carried by said flexible means adapted to engage said pairs of ratchet teeth and reciprocable means fixed to said flexible means.

3. A mechanical movement of the type described comprising a driving shaft, a grooved ratchet wheel on said driving shaft, a plurality of pairs of ratchet teeth on said wheel, a flexible wire in said groove extending part way round the periphery of said ratchet wheel, resilient means, supporting the ends of said wire, a cross-piece carried by said flexible wire adapted to engage said pairs of ratchet teeth and reciprocable means fixed to said flexible means.

4. A mechanical movement of the type described comprising a driving shaft, a ratchet wheel on said driving shaft, flexible means extending part way round the perphery of said ratchet wheel, resilient means supporting the ends of said flexible means, means on said flexible meansfor engaging the teeth 'of said ratchet wheel, means for disengaging said last mentionedmeans from'said ratchet said flexible means flexible means. V c i .5. A mechanical movement of the type described comprising a driving shaft, a' grooved ratchet wheel on said driving shaft, a plurality of pairs of ratchet teeth on said wheel, flexible means in said groove extending part a way round the periphery of said ratchet wheel, resilient means supporting the ends of said flexible means, a cross-piece carried by said flexible means adapted to engage said pairs of ratchet teeth, a cam adapted to disengage said cross-piece from said ratchet teeth, at a predetermined point on said ratchet wheel and reciprocable means fixed to said flexible means.

pairs of ratchet teeth and a grooved pulley engaged by a portion of said flexible means.

10. A mechanical movement of the type described comprising a driving shaft, a toothed wheel on said driving shaft, perforound the periphery of said wheel adapted to engage the teethithereon, resilient means for supporting the ends of said resilient means, and means on said first mentioned resilient means adapted to be reciprocated thereby.

In testimony whereof I have signed. this specification.

CHARLES LOUIS FLORISSON.

6. A mechanical movement of the type described comprisinga driving shaft, a grooved ratchet wheel on said driving shaft, a plurality of pairs of ratchet teeth on said wheel,

a flexible wire in said grooveextending part way round the periphery of said ratchet wheel, resilient means supporting the ends rate resilient means extending part way of said wire, a cross-piece carried by said flexible wire adapted to engage said pairs of ratchet teeth, an inclined plate adapted to disengage said cross-piece from said ratchet teeth at a predetermined point on said ratchet wheel and reciprocable means fixed to said flexible means. 7

7. A mechanical movement of the type described comprising a driving shaft, a grooved ratchet wheel on said driving shaft, a plurality of pairs of ratchet teeth onsaid wheel, flexible means in said groove extending part way round the periphery of said ratchet wheel, resilient means supporting the ends of said flexible means, a cross-piece carried by said flexible means adapted to engage said pairsof ratchet teeth, a bifurcated inclined plate extending on both sides of said ratchet wheel for disengaging said cross-piece from said ratchet teeth at a predetermined point on said ratchet wheel and reciprocable means fixed to said flexible means. Q

8. YA mechanical movement of thetype described comprising adriving shaft, a ratchet Y wheel on said driving shaft,'flexiblemeans extending part wayround' the periphery of flexible means in said groove extending part 1 way round the periphery .of said ratchet wheel, resilient means supporting the ends of said flexible means, a cross-piece carried by adapted to engage said 

